/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.compileflow.engine.core.definition;

/**
 * Represents a fundamental building block of a process graph, such as a task,
 * a gateway, or an event.
 * <p>
 * This is the base interface for all elements that can be connected by transitions.
 *
 * @author yusu
 */
public interface Node extends Element {

    /**
     * Gets the human-readable name of the node.
     *
     * @return The node name.
     */
    String getName();

    /**
     * Gets an optional tag associated with the node.
     * <p>
     * For stateful processes, this tag is used to uniquely identify a waiting
     * node so that it can be triggered externally.
     *
     * @return The node tag, or {id} if not specified.
     */
    String getTag();

}
